Re: Long Filename in NT Makes File Unusable

From: Alun Jones (alun_at_TEXIS.COM)
Date: 06/12/03

  • Next message: QS=E4rs=2C_Camillo=22?=: "Re: Chat with MS!" 
    Date:         Thu, 12 Jun 2003 16:55:55 -0500
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    > -----Original Message-----
    > From: Windows NTBugtraq Mailing List
    > [mailto:NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM] On Behalf Of Damian
    > Profancik
    > Sent: Thursday, June 12, 2003 9:22 AM
    > To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM
    >
    ...
    > However, the problem I am having is removing one of the files
    > that 2000 has added the .tmp extension to. The file is 226
    > characters in length (i.e.
    > ntuser.pol.tmp.tmp.tmp. etc.). When I attempt to delete it
    > off of a NT box from a 2000 or XP machine it won't let me.
    ...
    > However, anytime I tried to delete the new file I created of
    > 224 characters or even right-clicked on it, it crashed
    > explorer with a Dr. Watson error. I thought Windows could
    > handle filenames up to 256 characters. I was able to go back
    > to the XP machine and delete the file I created. I am
    > curious how the system created the 226 characters file.

    Speaking from a developer standpoint, I'm well familiar with "MAX_PATH",
    which holds the value 256. On FAT volumes, and in many tools, you can only
    create a _path_ whose total length is 256 characters or less. Occasionally,
    you can find this value met in such a way that makes it impossible to
    perform some actions in the normal fashion - for instance, anything that
    might add characters to the file name, or move it to temporary space. That
    it crashes Explorer is quite definitely a bug; but that it gets created at
    all should be of no great surprise.

    Many tools and functions will accept longer paths than 256 if you provide
    the path in a form that starts "\\?\" and is then followed by the path.

    As for deleting using the short file name, don't automatically assume that
    the short form will be first6~1.ext - you can find the short file name to
    delete or rename with "dir /x".

    Alun.
    ~~~~

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